Disintegrating mill



June 3, 1930. A, M MARSH 1,762,122

DI'S INTEGRATING MILL Filed Maron 12, 1928 26 as ulm-Kw4' 2 51 36 '25plates.v

Patented June 3, 1930 new..-

' oww@ PATENT,OFFICE@ ALBERT M. MARSILOF wAUWArosA, 'wisconsin AssIGNoRfro ALLIs-CHALMERS MANUFACTURINexooMPANY, orY ivrrLWAUKEn7V wrscoivsinn-Af Conromimroiv or DELAWARE DISINTEGRATING MILL Y' Appiiationnieamarch12, 192s. serial N0.- aeigozo. 'Y

The presentV invention relates in general to improvements in the vart oreducing granular substances, and relates l more specically. toimprovements in the construction andoperation of millsliordisintegrating materials such as grain or the like. A f

An object of the invention is to provide a relatively simple; v'compactand ecientdisintegrating mill especially adapted for the lo reduction of'grain or the like. Another object of the invention is to lprovideimproved apparatus in which granular material may be effectively reducedby the combined action of impact and attrition. A Jfurther object ofl 15the invention is to provide an improved reduction. mill wherein thedelivery of material from the source of supply,"isauto1natically checked'when the mill stops. Still lanother object of the invention isl toprovide improved 20 means for eecting rapid and convenient relativeadjustmentof the reducing .Plates Vof an attrition mill,V either for thepurpose of regulatingthe degree vofareducti'on orQor the purpose ofabnormallyseparating vthe Afurther object of the invention is to providea moton drivenA disintegrating 'mill' wherein the reduction surfaces maybefrela-r tively adjusted withoutlaflecting the operatingcharacteristics of the driving motor. An-` :ao other object oftheinvention is toprovide a quick release for -preventing damaging. of

ythe yattritionplates'or a" mill.in case unde-y sirablesuhstances areadmitted with the ymafA terial which isto be disintegrated. Still an!otherobject ofv vthe invention is to provide an improved reductionv"mill wherein oneof the reducing' elements is' rotated by means. ofk an'electric motor direct connected thereto, and in which the lrot'aryreducing ,element and the .entire motorkr arefsimultaneously movablefor"adjustment'purposesfl A further object of the invention to provideimprovements inmotorfmou'ntings especially vapplicable to motorthoroughly Vventilated condition.y Another object of theinvention is toprovide the motor may be located closely adjacent to i scription.

attrition mil-ls,`r and means for effectively dissipating created'during reduction of 'the material'and for maintaining the driving th-ereductionelements soas to form an eX-l tremely compact structure, andwherein the product being treated is prevented from reaching the drivingmotor. These and othery objects and 'advantages of the improvement, willappear in thecourse of the following de-v clear conception ofanembodiment o'Q. theinvention and of the manner `of operat- Y ing devicesconstructed in accordance there` with, may be had by referring to thedraw ing accompanying and forming a part'of this specification in whichrVlike reference characters designate thesame or similar partsin thevarious. views. f Fig. lis a top view of animproved motorldrivenldisintegrating mill. Y f Fig. 2 isa central vertical sectionthrough the improved mill.

QFig. 3 isa fragmentary erticalseCtionI" through theimaterial dischargeSp-Quirof the lmP'TOVGd dislntegrating mill." 'f Y Figi 4j is A afragmentary `vertical section through Aanother portion of' the millshowing the mechanism' for assembling, removing and adjusting partsthereof.

rThe improved 'disintegratingmillspecii; cally illustratedI in thedrawing comprises generally a fixed upper attrition plate 5 com-. posedof an annular series of plate sections stationarily mounted in aremovable cover l a movablelower attritionplate 7 composed of an annularseries otplate sections disposed beneath theplate 5 and rigidly.attached to a rotary disk 8 withinapperipheral retaining lip; a highspeed V'electric motor'll having a mam shaftA17"()Qrotatablev about avertical Vairisfand direct `connected .tothe disk 8 by means ofkeysandhexagonal clamping nuts 37 and a' suitable framef'for supporting themotor 11 andthe attrition-.plates 5;'7 andfforenclosing these elements.

The supporting and enclosing casing con-1 sists of a "base 2, an uppercasing 3v restingy upon and secured to the .base 25-fanda-cover i LdetachalolyV associated with the top 'of/ upper Casing idly, ofa seriesof clamping screws 29,; Vand readily removable from the :casing B'whenvThe ,Cevef'isglwrmally rig: attached witheupperfcasns Shy meansv f ionthe clamping screws 29 have been released, by means of jack screws 3()and looking nuts 31 cooperating therewith, see Fig. 4. The jack screwsand the nuts 31 are spaced at intervals about the cover 4, and alsoserve to aline the cover 4 and the upper plate 5 associated therewith sothat the plates 5, 7 will be Vdisposed parallel to each other anduniform disintegration is insured. The cover 4 is provided with a.central feeding eye 6 rotor 8 in order to prevent escape of materialfrom the chamber 42 toward the motor 11.

The motor 11 is mounted centrally within the casings 2, 3 by means of athrust bearing 19 and a series of centering lugs 12 secured to the frameof the motor. The thrust bearing 19 is supported by an adjustable arm 18one end of which is secured to the base 2 by means of a pivot 2O and theopposite end of which extends freely through an opening in the side wallof the base 2 and rests upon a helical release spring 22 associated withan adjusting rod 21. The adjusting` rod 21 has an upper screw threadedend portion which cooperates with an adjusting` hand wheel 2 Vafterpassing upwardly through a movable bracket 24. vA locking hand wheel 26cooperates with the rod 21 and with the lower end ofthe movable bracket24, to lock the rod 21 in adjusted position. The hand wheel 23 vreactsagainst the upper end of the bracket 24 and the latter is supported byan eccentricV 27 mounted in fixed bearings in a stationary bracketmember 25. The eccentric 27 is rotatable by means of a release lever 28so as to quickly drop the rod 21 and hence the arm 18 and motor 11together with the disk 8 and plate 7, away from the stationary plate 5,thereby separating the plates 5, 7 and stopping the disintegratingaction.

The lugs 12 Vwhich are secured to the motor Y frame are provided withslots within which from the exterior of the base 2. Partition keys 38are retained by means of lateral pins and coil springs 13 as shown inFig. 2. TheY keys 38 cooperate with keyways 36 formed vin the base 2,and adjusting screws V14 coop-V erate with the springs 13 therebypermitting centering` of the motor 11, the disk 8 and the plate 7relative to the stationary plate 5,

` j plates 32, 33 are associated with the lugs 12 y andl cooperatewwithinternal bores of flanges formed integralfwith theV base 2, to providemeaiaz freely vertically slidable partitions which form segregatedchambers 39, 40, 41.

Each of the chambers 39,740 is provided with a fresh air inlet opening15, and the intermediate chamber 41 is provided with a foul airdischarge opening 34. The mot-or end heads 16, 17 are also provided withair admission openings and the medial portion of the motor frame isprovided with an annular series of air delivery openings 35 communieating with the chamber 41. With this arrangement an abundance of freshair admitted through the inlet openings 15 constantly circulates throughthe motor end heads 16, 17, and afterV effectively cooling the motorstructure the air is delivered through the openings 35, the chamber 41and the final discharge opening 34 to the atmosphere.

l During normal operation of the improved disintegrating mill, the motor11 is being operated to produce rapid rotation of the disk A8 and of thelower disintegrating plate 7,

the plates 5, 7 having been relatively adjusted to effectively reducethe material advancing therealong. The material requiring reduction isdelivered through the feeding eye 6 by gravity, and upon striking theirregular' clamping nuts 37 is thrown outwardly against the stationarycover 4 and plate 5 being thus initially broken up by impact. Thepartially disintegrated material is then urged through the space betweenthe plates 5, 7 by centrifugal force and is thus further reduced byattrition. Due to the extremely high speed of rota-tion, this speedordinarily being 3600 R. P. M., the material admitted to and passingthrough the machine is rapidly reduced and delivered from the peripheryof rotating plate 7 by centrifugal force and by the air which is pumpedthrough the attrition space during rotation of the 4disk 8. Thedisintegrated material is eventually discharged from the machine throughthe spout 9 by the fanning action of the rotor and by the air currentsset up within the disintegrating chamber 42. The lower surface Aof therotating disk 8 also acts to produce aflow of airj outwardly therealong,thereby maintaining the lower portion of the chamber 42 free frommaterial and also producing a slight flow of air from the chamber 39into the chamber 42 thus `preventing escape of dust toward the motor 11.

VhileV the motor 11 is in operation, air is drawn into the chambers 39,40 vthrough the inle-topenings 15, and after passing through the motor11, this airis discharged through the openings 35, the chamber 41 andthe final discharge opening 34 to the atmosphere. The air thuscirculating through the motor structure maintains'the same relativelycool andsquickly dissipates the heat created during attrition. andtransmitted from the plate 7 and Ydisk 8 through the shaft 10 to themotor rotor. y

If during normal operation of the machine an undesirably hard piece ofmaterial such as metal enters the feeding eye 6, the rotary plate 7 andthe disk 8 together with the motor 11 will be forced the spring 22 andthereby permitting the undesirable piece of material to pass through ingthe adj ustin the attrition space without breaking the machine. Thespace Dbetween the plates 5, 7 may also be readily adjusted to vary thedegree of disintegration, by releasing the locking wheel 26 and bysubsequently manipulatvwheel 28. After adjustment has been eected thelocking wheel 26 may again be brought into engagement with the movablebracket 24. If it becomes desirable to quickly withdraw the rotary plate7 from the stationary plate 5, it is only necessary to swing the lever28 through a pre- Y to the stationary plate 5 by manipulation ofsemblage of elements.

Vviously be provided with additional irreguthe adjusting screws 14.Sufcient clearance should however be allowed between the plates v 32, 33andthe adjoining structure, to permit free vertical movement of themotor 11 relative to the base 2. j

`From the foregoing description it will be apparent that the motor 11may be located in close proximity to the reduction chamber 42 therebyproviding .an extremely compact mill, without danger of overheating. Thedirect connection of the motor to the disk 8 provides an extremelysimple and efficient as- 'Ihe nuts 37may` oblarities in order to enhancethe initial impact action, such action being desirable when operatingupon caked material, and cooperating with the attrition disks 2 toeffectively Vre-v duce such material. By admitting the mate-l rialthrough a feeding eye 6 above thezcentcr of the disk 8, the flow ofmaterial is auto;

Y matically checked when rotation ofthe disk 8 stops. The variousadjustments .may be mat`1 from the exterior of the machine-withy outinterfering with the operation thereof, and the plates 5, 7 may bequickly renewed by removing the cover 4. The spring 22 and 3 the quickrelease device consisting of the lever y28 and eccentric 27, providesafeguards for preventing destruction of the machine. v By causing theentire motor 11 to move with the disk 8 and plate 7 during relativeadjustment of the plates and during abnormal axial downwardlycompressing j movement of the lower plate 7, the relative position ofthe'motor rotor and stator, are not affected. The air currents createdwithin the reduction chamber 42 during normal operation of the machineeffectively deliver the reduced material and assist in producing amachine ofmaximum capacity. A

It should be understood thatit is not de- Y sired to limit the inventionto Ythe exact'details of construction herein shown and de! l scribed forvarious modifications within the scope'of the claims may occur topersons skilled in the art.l j

It is vclaimed and desired to secure 'by Letters Patent:

1. In combination, a fixed attrition plate, a movable attrition platecooperating with the underside of said fixed` plate, means for feedingmaterial between said plates, a Ymoi Y tor having al rotor directconnected'to said movableplate for rotating the same about a verticalaxis, and means for simultaneously moving said movable plate and theentire motor structure relative to said fixed plate.

2.. In combination, a fixed attrition plate,v

a movable attrition plate cooperating with j the underside of said fixedplate, means for feeding material upon said movable plate,

means for initiallyV reducing` the admitted` material by yimpact and forsubsequently fur-v ther reducing the same by attrition, and means foreffecting adjustment vof said movable plate relative to said fixedplate.

3. In combinatioma fixed attrition plate, a movable attrition `platecooperating with the underside of said fixed plate, means for feedingmaterial through said fixed plate upon said movable plate, Vmeansincluding an adjusting wheel kand vertical adjustment of said'movableplate relative to said fixed plate, and means Vco-V operating with saidrod but lfunctioning independent-ly of said adjusting wheelV for fromVeach other.

quickly relatively moving said plates away 4. In combination, a pair ofcooperating attrition plates, a motor having a rotor direct connected toone of said plates for rotating ieti a rod for effecting y the same,said motor being located closely Y adjacent to said plates, a casingsupporting said plates and enclosing said motor to pro;v Y vide a connedspace between saidmotor and said plates, and means'for admitting air'-through` said space and said motor to dissipate heat producedduringnormal func-l tioning of said plates.

In combination, a pair of cooperating attrition plates, Ya motor forrotatingA one of said'plates relative` to the other, a casing forsupporting said plates and for enclosing said motor, and resilientmeans` associated with `said casing for relatively centering said uplates by shifting-fY said motor laterally within said casing.

6. In combination, a pair of cooperating attrition plates, a motor :torrotating one of said plates relative to the other, a casing forsupporting said plates and said motor, a thrust bearing associated Withsaid casing and coacting with the lower end of said motor for sustainingthe Weight of said motor and one of said plates, and a guide bearingassociated with said casing and coacting with the sides ofsaid motor formaintaining said plates concentric.

7. In combination, a pair of cooperating attrition plates, a motor forrotating one of saidrplates about a vertical axis, a Casing supportingsaid plates and said motor, a plurality of parallel guideways associatedWith said casing and coacting directly with the framefof said motor topermit movement of said rotary plate toward and away from the other, andresilient means for centering said motor relative to said guideways.

8. In combination, a pair of cooperating attrition plates, a motorhaving a rotor direct connected to one of said plates for rotating thesame relative to the other, resilient means u for restraining bodilymovement of said motor longitudinally of its axis of rotation, andresilient meansv for restraining movement of said motor laterally ofsaid axis.

Inktestimony Wliereof, the signature of the invent-or is aiiixed hereto.

ALBERT M. MARSH.

